Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
factor ((2n+3)^3-12n(n+1)-20(n+1)-1)/6
factor ((2n+3)^3-12n(n+1)-20(n+1)-1)/6
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random